When the following isomeric alkenes are fully hydrogenated, rank the amount of heat released during the hydrogenations, from most heat produced (1) to least heat produced (4). (3 points) 3. 4. Not including E/Z stereoisomers, how many different structural isomers could be formed when the following bromide undergoes E2 elimination upon treatment with NaOH? (Some may be formed in small amounts.) (3 points) a. 2 b. 3 C. d. 5 e. 6 Br
Solution
3. Heat of hydrogenation depends upon the stability of alkene . More will be the stability of alkene less will be the heat of hydrogenation. Let we give numbering to the alkenes as 1,2,3 and 4 as in the order in the picture .
4th alkene is least stable and 1st one is most stable alkene .
2nd is more stable than least stable and 3rd is more stable than second .
Hence order of most heat producing alekene to least heat producing alkene is ,,,
4>2>3>1 .
4th will produce highest heat of hydrogenation as least stable and 1st will produce lowest heat of hydrogenation as most stable.
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When the following isomeric alkenes are fully hydrogenated- rank the a.docx
1. When the following isomeric alkenes are fully hydrogenated, rank the amount of heat released
during the hydrogenations, from most heat produced (1) to least heat produced (4). (3 points) 3.
4. Not including E/Z stereoisomers, how many different structural isomers could be formed
when the following bromide undergoes E2 elimination upon treatment with NaOH? (Some may
be formed in small amounts.) (3 points) a. 2 b. 3 C. d. 5 e. 6 Br
Solution
3. Heat of hydrogenation depends upon the stability of alkene . More will be the stability of
alkene less will be the heat of hydrogenation. Let we give numbering to the alkenes as 1,2,3 and
4 as in the order in the picture .
4th alkene is least stable and 1st one is most stable alkene .
2nd is more stable than least stable and 3rd is more stable than second .
Hence order of most heat producing alekene to least heat producing alkene is ,,,
4>2>3>1 .
4th will produce highest heat of hydrogenation as least stable and 1st will produce lowest heat of
hydrogenation as most stable.
